Preckwinkle is currently president of the board of Commissioners in Cook County, IL and has worked as a school teacher and in the Economic Development Office for the City of Chicago. Lightfoot has served as senior equity partner in the litigation and conflict resolution group at Mayer Brown LLP. She has also served as an Assistant U.S. Attorney in the criminal division. Following the runoff election, Chicago will elect the first black woman as mayor of the city.